3. Thinly slice beef and pound to tenderize it. Place the beef slices in vinegar for ½ hour. Coat the top of the meat with cooking spray and season with the salt, pepper, and oregano. Broil steak from 3 to 5 minutes, coating the other side with cooking spray when half way through to desired doneness, then keep warm.

4. Add the oil to a small sauté or frying pan and heat until hot, then add onions and sauté until browned. Remove the onions from the pan, and drain between 2 layers of paper towels.